One of my favourite songs by gospel icon Sfiso Ncwane is entitled Kulungile Baba. You may know it? It’s a firm fan favourite. But as I walked into the Grace Bible Church in Soweto on Friday morning, the words of the song stirred deep inside my heart.

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The Shebab, a group which has been battling the Western-backed government in Somalia and proclaims allegiance to al Qaeda, has in recent months suffered several major setbacks.

An offensive led by African Union troops has stripped the Shebab of most of their former bastions, including the southern port of Kismayo, a key asset Kenyan forces wrested back just over a month ago.

"This is a flagrant Crusader invasion of the Muslim countries and it makes jihad obligatory on every Muslim who is capable in Somalia and its surroundings and in the rest of the world until the invaders are expelled," the SITE Intelligence Group quoted Zawahiri as saying.

"Don't worry about the numbers of the Crusaders and their equipment, for these are spoils of war that are brought to you by the help of Allah," Zawahiri said.

"Therefore, make them taste the fire of jihad and its heat. Pursue them with guerilla warfare, ambushes and martyrdom-seekers."

The website said the Shebab had also posted several messages on the Internet vowing to intensify attacks in Mogadishu.

Since the Shebab abandoned fixed positions in Mogadishu last year, under pressure from African Union troops, the war-ravaged seaside capital has been slowly coming back to life.

The Shebab once controlled up to 80 percent of southern and central Somalia and the recent African offensive dashed their hopes of taking power.

But analysts have warned the al Qaeda-allied group could do just as much damage by reverting to guerrilla tactics and carrying out targeted attacks.

On Saturday, two suicide bombers attacked a Mogadishu restaurant popular with former exiles, wounding several people.